The 4 Types of Roof Inspection, and When You Need Each

When a homeowner calls and says "I need a roof inspection," they usually picture one thing: someone walking the shingles with a clipboard. In practice, a thorough inspection can draw on as many as four distinct methods, plus a look from inside the attic, and each one is built to catch a different kind of problem. A drone camera cannot feel a soft spot in the deck. A ground-level walk-around cannot see trapped moisture inside a flat roof membrane. Knowing what each method actually does, and does not do, is the difference between an inspection that just looks at your roof and one that tells you the truth about it.

01 / THE SHORT ANSWERFour methods, four different views of the roof

The four inspection types Macomb County roofers use are: a visual ground-level check, a walk-on physical inspection, a drone aerial survey, and an infrared thermal moisture scan. A fifth step, the attic-side check, is not a stand-alone method so much as the piece that ties the other four together, because water rarely stains the ceiling directly below where it entered the roof.

• Visual, ground-level: a fast, low-cost first look for obvious damage and sagging.
• Walk-on, physical: boots on the shingles, hands on the flashing, the closest thing to a hands-on diagnosis.
• Drone aerial: a full high-resolution view of the whole roof field, including areas that are unsafe or impractical to walk.
• Infrared thermal: a heat-signature scan that can reveal moisture trapped under the surface, before it becomes a visible leak.

None of the four methods is universally "better." Each one trades reach for detail, or speed for depth. The rest of this guide walks through what each catches, where it falls short, and the specific situations, routine upkeep, storm damage, a home sale, or an unexplained leak, that call for it.

Part of the confusion is that most roofing companies advertise "a free roof inspection" as if it were one fixed procedure, then quietly decide on-site which of the four methods, or which combination, actually fits the roof in front of them. That is the right way to do it. The problem is that homeowners rarely hear the reasoning, so a drone survey on one house and a walk-on inspection on the neighbor's house can look like inconsistent service instead of two correct decisions for two different roofs. Knowing the four types in advance lets you ask the right question when you book: which methods will you use on my roof, and why.

02 / FROM THE DRIVEWAYVisual, ground-level inspection

This is the simplest and least invasive method: someone stands on the ground, or occasionally at a second-story window or a ladder, and looks at the roof with the naked eye or binoculars. No one gets on the roof. It is often the first pass in any inspection, and for homeowners doing their own periodic check, it is the method available without calling anyone.

What it catches

A ground-level look is genuinely useful for the damage that shows up big: missing or badly curled shingles, an obvious sag in the roofline, a chimney cap that has come loose, gutters pulling away from the fascia, or a visible tarp or hole after a storm. It is also how most homeowners first notice granule buildup collecting in the gutters, a sign of shingle wear worth a closer look.

What it misses

Almost everything small. Cracked sealant at a pipe boot, a lifted tab three courses up, hairline flashing separation at a chimney, the true extent of granule loss, none of these are visible from thirty or more feet away, especially on a roof with any pitch. A ground-level look can tell you a roof probably has a problem. It cannot tell you what the problem is or what it will cost to fix.

When it is the right call: as a quick first pass after a storm to decide whether a fuller inspection is warranted, or as part of routine seasonal upkeep between more thorough checks. It is never the right method to base a repair or replacement decision on by itself.

A useful habit for homeowners is to do this ground-level pass twice a year, once in spring after the freeze-thaw cycles that build ice dams, and once in fall before winter weight and wind arrive, and again any time a storm with high wind or hail passes through the area. None of that replaces a professional inspection, but it does mean small problems, a lifted ridge cap, a sagging gutter section, get noticed within a season rather than sitting unaddressed for a year or more.

03 / BOOTS ON THE ROOFWalk-on, physical inspection

This is the method most people mean when they picture a roof inspection. A technician gets on the roof itself and physically examines the shingles, flashing, vents, valleys, and penetrations up close, often supplementing the visual check with a moisture meter or a hand-press on suspect areas of decking.

What it catches

Being physically present lets an inspector feel a soft or spongy section of decking underfoot, something no camera can register. It is also the only method that reliably shows the true condition of flashing, sealant around boots and vents, and nail placement, because these details need to be examined within a few feet, not a few dozen. A walk-on inspection is what produces a defensible, itemized list of what is wrong and what a repair would involve.

What it misses

A walk-on inspection sees the surface. It does not see moisture trapped below the membrane or deck, and it cannot be safely or responsibly done on every roof. Steep pitches, wet or icy conditions, aging or brittle tile, and some flat commercial membranes are cases where walking the surface risks damaging the roof or the technician. In those situations, a drone survey or an infrared scan takes over the job a walk-on inspection would otherwise do.

When it is the right call: diagnosing a specific repair, evaluating a roof before buying or selling a home, or any time the condition of flashing and decking, not just the shingles, needs to be confirmed by hand. Our dedicated drone vs walk-on comparison guide goes deeper on how we decide which of the two to use, and often we use both on the same visit.

There is also a courtesy side to a walk-on inspection that is easy to overlook: a technician who is careful about foot placement, uses roof jacks or padded footwear on delicate materials, and avoids walking a roof when it is not appropriate to do so is protecting the asset they are there to evaluate. A rushed or careless walk-on inspection can create the very damage it is supposed to be checking for, which is one more reason the decision to walk a roof, and how, should never be automatic.

04 / EYES IN THE AIRDrone aerial inspection

A camera drone flies a slow, deliberate pattern over the roof, capturing high-resolution photos and video of the entire field from directly overhead and at low oblique angles. It has become one of the most common methods for storm damage documentation because it can cover a large or complex roof in minutes and photograph every slope from the same vantage point, not just what a technician can safely reach on foot.

What it catches

A drone survey is unmatched for seeing the whole roof at once: patterns of hail bruising across a field of shingles, the full extent of wind damage after a storm, debris in valleys, and the condition of steep or tall sections that would otherwise require ladders and harnesses just to look at. Because the images are geo-tagged and time-stamped, they also make strong documentation for an insurance claim.

What it misses

A drone cannot feel a soft spot in the decking, and it cannot detect moisture that has not yet caused a visible surface change. Photo resolution, however good, is still a substitute for touch, not a replacement for it. Weather is also a real constraint: wind, rain, or low light can ground a flight or degrade the imagery. For those reasons a drone survey is often paired with a walk-on inspection of the areas it flags, rather than used entirely on its own.

When it is the right call: steep or multi-story roofs, storm damage documentation across a large area, and any situation where a full-field photographic record matters as much as a hands-on read. The full breakdown of when a drone wins and when boots on the roof still win is in our drone vs walk-on inspection guide.

05 / WHAT THE EYE CANNOT SEEInfrared thermal moisture inspection

An infrared, or thermal imaging, camera does not photograph the roof surface at all. It measures subtle differences in surface temperature, and because wet insulation and wet roofing materials hold and release heat differently than dry materials, a thermal scan can reveal moisture trapped beneath a membrane or deck well before it shows up as a stain, a soft spot, or a drip inside the building.

What it catches

This method is most valuable on flat and low-slope commercial roofs, where a membrane can trap water for months without any visible sign at the surface or the ceiling below. A thermal scan can map the extent of a hidden wet area, which is often much larger than the point where a leak eventually shows up inside, and that map tells a contractor exactly which sections of membrane and insulation need to come out rather than guessing.

What it misses, and when it works

Thermal scans depend on a real temperature differential to work, which usually means scanning after a sunny day, once the roof surface has absorbed heat and begun to cool in the evening; wet areas release that stored heat more slowly than dry ones and show up as a different signature on the camera. Cloudy weather, a recently rained-on roof, or a roof color and ventilation pattern that evens out temperature can all make results harder to read, which is why this method is typically run by someone trained to interpret it rather than treated as a simple photograph. On a standard sloped asphalt shingle home, it is rarely the first tool reached for; it earns its keep on flat and commercial roofs and on stubborn leaks that other methods cannot pin down.

When it is the right call: commercial or flat roof surveys, chasing an active leak whose source is not obvious from the surface, or due diligence before buying a building with a low-slope roof. Our infrared inspection guide covers the process in more detail, and our commercial and flat roofing page covers the systems it is used on most.

06 / THE STEP MOST HOMEOWNERS SKIPThe attic-side check that belongs with all four

Every method above looks at the roof from outside. None of them, on their own, explains why a ceiling stain three rooms away from the obvious damage keeps reappearing. That is because water almost never drips straight down from where it entered. It runs along the underside of the deck, follows a rafter, and shows up on drywall well away from the actual entry point. The only way to trace that path is from inside the attic.

What it catches

From inside the attic, an inspector can see water staining and its direction of travel on the underside of the deck, daylight coming through gaps that indicate a hole or a failed flashing detail, insulation that has been compressed or displaced by moisture, and signs of condensation or mold that point to a ventilation problem rather than a roof leak at all. It is also the only vantage point that shows whether ridge vents, soffit intake, and baffles are actually doing their job, which matters as much for ice dam prevention in a Michigan winter as it does for hunting an active leak.

Why it accompanies every inspection type

A ground-level check, a walk-on inspection, a drone survey, and an infrared scan each answer the question "what does the outside of the roof look like." The attic-side check answers a different question: "where is the water actually going, and why." Pairing an exterior method with an attic-side look is what turns a list of surface observations into an actual diagnosis. Our own process, including the attic-side check, is laid out step by step in what happens during a roof inspection, and the attic-specific mechanics are covered in our attic-side inspection guide.

07 / THE MATCH-UPWhich type you need, and when

In practice, the right inspection is rarely just one method. It is the combination that fits the roof, the roof type, and the reason you are inspecting it in the first place. Here is how the four situations we hear most often tend to sort out.

SITUATION	TYPICAL METHOD	WHY
Routine annual check	Visual ground-levelplus attic-side	Fast, low-cost, catches the big issues and confirms ventilation is healthy
After a storm	Drone aerialplus walk-on where safe, plus attic-side	Full-field damage documentation, then hands-on confirmation of what the photos show
Buying or selling a home	Walk-onplus attic-side	A defensible, itemized condition report; infrared is added for flat or commercial roofs
Chasing an unexplained leak	Attic-side firstthen walk-on or infrared	Traces where the water is actually going before guessing at the exterior source

One more distinction worth naming: a roof inspection and a roof estimate are related but not identical. An inspection documents condition; an estimate prices a scope of work. If your inspection turns up a repair need, our inspection service page explains how that visit rolls straight into a written price, and the cost calculator gives you a ballpark of what repairs in that range typically run before anyone sets foot on your roof.

An inspection that only looks at the outside of the roof answers half the question. The attic tells you where the water actually went.

The good news is that you do not have to choose the method yourself. When you book a free inspection with us, we decide which combination fits your roof, a steep multi-story home gets a drone pass and a careful walk-on where it is safe; a flat commercial roof gets an infrared scan; every visit includes the attic-side check, because it is the piece that turns observations into an actual answer. Start from the inspection request form or see our published ranges on the pricing page for what happens if the inspection turns up a repair or replacement need.